The ATPase activity of the myosin head is dependent on:
1. Magnesium ions
2. Manganese ions
3. Calcium ions
4. Ferric ions
Skeletal muscle bundles [fascicles] are held together by a common connective tissue layer called:
1. Perimysium
2. Endomysium
3. Fascia
4. Aponeurosis
During muscle contraction, the length of all the following gets reduced except:
1. H-Zone
2. A-Band
3. I-Band
4. Sacromere
What is true about the white muscle fibers?
1. Myoglobin content is high
2. They have a large number of mitochondria
3. They depend on anaerobic process for energy
4. They are adapted for slow sustained activities
The human ribs are termed as bicephalic because:
1. | They have two articulations surfaces on their ventral end. |
2. | They have two articulations surfaces on their dorsal end. |
3. | They have two articulations surfaces on their ventral end and two on the dorsal end. |
4. | They have two articulations surfaces on their ventral end and one on the dorsal end. |
The clavicle is articulated with the:
1. Xiphoid process of the sternum
2. Acromion of the scapula
3. Glenoid cavity of the scapula
4. Head of the humerus
Identify the incorrectly matched pair:
Joint Type
1. Proximal radio-ulnar joint Pivot
2. Joint between the carpals Gliding
3. Joint between metacarpal of Saddle
thumb and phalange
4. Humero-ulnar joint Hinge
The globular head of the myosin filament has active site/s for binding to:
I. ATP
II. the binding site for actin filament
III. Calcium
1. Only I
2. Only I and II
3. Only II and III
4. I, II, and III
Scapula is a large triangular flat bone situated in the dorsal part of the thorax between:
1. the second and fifth ribs
2. the second and seventh ribs
3. the third and sixth ribs
4. the third and eighth ribs
The upper ends of the forearm bones articulate with each other in a:
1. pivot joint
2. ellipsoid joint
3. saddle joint
4. hinge joint